Gem Guide

Gem Guide

	Alexandrite changes from green to red, mauve or brown in incandescent light. Alexandrite has a hardness rating of 8.5. There are many many synthetic Alexandrites on the market. Natural Alexandrite is very rare and is found in Brazil, Madagascar, Myanmar, Russia, Sri Lanka and Zimbabwe.
	Amethyst is purple quartz and is one of the most popular gemstones. It can also be lilac or mauve and changes from green to red, mauve or brown in incandescent light. It varies from pale lavender to deep purple with red highlights. It has a hardness of 7. Amethyst is generally abundant and quite inexpensive. The highest quality is transparent.
	Aquamarine is light blue, blue-green and dark blue and often becomes paler if left out in the sun. It has a hardness of 7.5. The highest quality is transparent.
	Citrine is yellow to brown quartz. It varies from pale yellow to rich golden yellow to dark orange. Although citrine may occur naturally, much is produced by heating amethyst under controlled conditions. Darker colors are more highly prized, including medium golden orange ("Rio Grande" citrine) and dark sherry-colored ("Madeira" citrine).
	Diamonds are slightly yellowish, and in this general color range, those most approaching absolute lack of color are most prized. However, brightly colored diamonds are much more rare and more expensive. It has a hardness of 10. The deep blue Hope Diamond and blue Eugenie Diamond, both in the Smithsonian collection, are among the most famous examples.
	Emeralds are medium to dark green beryl which derives its color from chromium and vanadium. Emerald has a hardness rating of 7.5. Almost all emeralds contain numerous small inclusions and fractures that promote fragility. Most stones on the market are impregnated with oils, waxes, or other substances to mask the fractures and sometimes enhance color. The best known sources include Colombia and Zambia.
	Garnets are usually dark brownish to purplish red, and are usually cut in small sizes (under 2 carats), as larger stones appear black. Garnet ranges in color from colorless to black though it is often thought of as only red. There are various types of garnet with the hardness ranging from 7 - 7.5.
	Jade has two types: Jadeite and Nephrite. Jadeite is rarer and the highest quality is known as Imperial Jade. Jadeite comes in many colors: red, yellow, green, lilac, black, orange, white, pink, blue and brown and has a hardness of 7. Nephrite Jade comes in various tones of green -- mostly with an olive green tone and has a hardness of 6.5. Nephrite Jade is more common and is often used in Chinese carvings.
	Onyx is a rich-looking, affordable black stone. It is often mixed with pearls to create elegant jewelry. Onyx, sard, and sardonyx are all varieties of chalcedony (microcrystalline quartz). Onyx comes in brown, white, grey, and black. Sard is a reddish-brown variety. Sardonyx is a blend of sard and onyx with the red bands of sard and the white bands of onyx. Onyx, sard and sardonyx all have a hardness rating of 7.
	Opal in large sizes are rare and costly, especially black opal. Opals are usually cut as cabochons, sometimes beads and are occasionally found as fossilized (opalized) clamshells, snail shells, or wood. Transparent opals, such as Mexican red or orange fire opal, are often faceted. Values are normally determined by the presence and nature of color flashes (play of color). Opal's scratch hardness is measured at 6.0 to 6.5 on the Mohs' scale, similar in hardness to quartz, a little more than halfway between the hardness of talc and diamond.
	Pearls are formed in shellfish, as a reaction to an irritant. Cultured pearls are created by adding a piece of mantle tissue or shell inside of an oyster or mussel. This then creates a pearl as layers of the inside of the shell grow over the added substance. Pearls are generally white, brown, silver, cream, black or pink depending on the type of shellfish and water and has a hardness of 3. The price of pearls varies widely as a result of luster, size, how they were grown, color and type. Natural pearls are the most expensive, followed by cultured pearls. Freshwater pearls tend to be relatively inexpensive.
	Peridot is a transparent lime or olive green. It has a hardness of 6.5. As with all gems, protect peridot from scratches and sharp blows. Also avoid large temperature changes (such as leaving it by a heater vent or in a hot car). Do not clean peridot in a home ultrasonic cleaner.
	Ruby may be any color of red depending on the chromium and iron content of the stone. Ruby has a hardness rating of 9. Generally, ruby is quite durable. Still, rubies are subject to chipping and fracture if handled roughly. Ruby is found worldwide, the finest stones are from Myanmar and the bright red stones are mined in Afganistan, Pakistan and Vietnam. Brownish-red rubies are from Thailand and darker stones are generally produced from the mines in Australia, India, Russia and USA (Georgia, North Carolina and Wyoming).
	Sapphire is all gem quality corundum that is not red, such as blue, orange, yellow, violet, green, white and pink. Unless a color is stated, sapphire is assumed to be blue, with some sapphires (color change sapphires) will change between blue and violet depending on the light. Sapphire has a hardness of 9. Generally, sapphire is quite durable. Still, sapphires are subject to chipping and fracture if handled roughly.
	Tanzanite may be blue, purple or slate gray and has a hardness rating of 6.5. Tanzanite is often heat treated to improve its color and clarity. Tanzanite can easily be scratched or chipped. Clean your Tanzanite with warm, soapy water and a soft bristle brush. Avoid using ultrasonic cleaning.
	Topaz comes in many colors such as blue, yellow, pink, brown, green and clear. Orange-red "Imperial" Topaz is rare. Topaz has a hardness of 8. As with all gems, protect topaz from scratches and sharp blows.
	Tourmaline comes in many colors such as blue, yellow, pink, red, black, green and clear. It has a hardness of 7.5. As with all gems, protect tourmaline from scratches and sharp blows.
	Zircon is a natural stone - not to be confused with Cubic Zirconia which is manmade. It is known as a colorless stone used to imitate diamonds but also comes in: blue, yellow, orange, red, brown and green . It has a hardness of 7.5. Zircon is somewhat soft so avoid scratches and sharp blows. Avoid hot water and household chemicals.